import java.util.HashMap;
import java.util.Hashtable;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Creat with IntelliJ IDEA
 * Description
 * User: mamba24
 * Date: 2022-09-02
 * Time: 23:09
 * To BE A Better Person-2020-3-2
 */
public class TestDemo3 {
    //HashTable, HashMap, ConcurrentHashMap
    public static void main(String[] args) {
        Hashtable<Integer,Integer> hashtable=new Hashtable<>();
        HashMap<Integer,Integer> hashMap=new HashMap<>();
        ConcurrentHashMap<Integer,Integer> concurrentHashMap=new ConcurrentHashMap<>();
        //hhh

    }

}
